| No. | Item | Definition |
|---|---|---|
| 1. | agnostic | not claiming certainty |
| 2. | allegedly | claimed without proof |
| 3. | ambivalence | mixed feelings or uncertainty |
| 4. | ambivalent | having mixed feelings |
| 5. | apparently | seemingly, not certainly |
| 6. | apprehensive | anxious and doubtful |
| 7. | apprehensively | with anxious uncertainty |
| 8. | arguable | open to debate |
| 9. | cagey | reluctant to commit |
| 10. | conflicted | torn by opposing thoughts |
| 11. | contestable | able to be challenged |
| 12. | cynical | doubting sincerity or goodness |
| 13. | cynically | with distrustful doubt |
| 14. | debatable | open to doubt |
| 15. | disbelief | refusal to believe |
| 16. | disbelieving | not accepting as true |
| 17. | disputable | open to disagreement |
| 18. | distrustful | not ready to trust |
| 19. | doubt | lack of certainty |
| 20. | doubtful | feeling or showing doubt |
| 21. | doubtfully | with uncertainty |
| 22. | dubious | having doubts |
| 23. | dubiously | in a doubtful way |
| 24. | equivocation | deliberate ambiguity |
| 25. | fishy | seeming suspicious |
| 26. | flimsy | weak and unconvincing |
| 27. | gray area | uncertain situation |
| 28. | guarded | careful and reserved |
| 29. | guardedly | with caution |
| 30. | hesitant | slow from uncertainty |
| 31. | hesitation | pause from uncertainty |
| 32. | I wonder | expressing doubt or curiosity |
| 33. | iffy | doubtful or uncertain |
| 34. | incredulous | unwilling to believe |
| 35. | incredulously | with disbelief |
| 36. | indecision | inability to decide |
| 37. | indecisive | unable to decide confidently |
| 38. | indeterminate | not exactly known |
| 39. | insecure | lacking confidence or certainty |
| 40. | irresolute | showing indecision |
| 41. | irresolution | lack of firm decision |
| 42. | leery | suspicious or wary |
| 43. | maybe | possibly but uncertain |
| 44. | misgiving | feeling of doubt |
| 45. | mistrust | lack of trust |
| 46. | mistrustful | inclined to suspect |
| 47. | murky | unclear and doubtful |
| 48. | noncommittal | avoiding clear commitment |
| 49. | not convinced | still doubtful |
| 50. | not sure | uncertain |
| 51. | on the fence | unable to decide |
| 52. | open question | not yet settled |
| 53. | ostensibly | apparently, though perhaps not |
| 54. | perhaps | possibly |
| 55. | perplexed | uncertain and confused |
| 56. | possibly | it may be true |
| 57. | precarious | uncertain and unstable |
| 58. | presumably | probably, though not certain |
| 59. | provisional | temporary and not certain |
| 60. | purportedly | said to be true |
| 61. | puzzled | confused and doubtful |
| 62. | qualm | uneasy doubt |
| 63. | question mark | source of uncertainty |
| 64. | questionable | open to doubt |
| 65. | questioning | showing doubt or inquiry |
| 66. | questioningly | with doubt or inquiry |
| 67. | reportedly | according to reports |
| 68. | reservation | lingering doubt |
| 69. | seemingly | appearing to be true |
| 70. | shaky | not firm or certain |
| 71. | skeptical | not easily convinced |
| 72. | skeptically | with doubt |
| 73. | skepticism | doubting attitude |
| 74. | supposedly | claimed but uncertain |
| 75. | suspicion | feeling something is wrong |
| 76. | suspicious | inclined to distrust |
| 77. | tentative | not fully decided |
| 78. | tentatively | without full certainty |
| 79. | tentativeness | lack of firmness |
| 80. | tenuous | weak and uncertain |
| 81. | touch-and-go | uncertain outcome |
| 82. | uncertain | not sure or confident |
| 83. | unconfirmed | not verified yet |
| 84. | unconvinced | not persuaded |
| 85. | undecided | not having chosen |
| 86. | unpersuaded | still not convinced |
| 87. | unproven | not established as true |
| 88. | unsettled | not resolved or calm |
| 89. | unsure | not certain |
| 90. | untested | not yet proven |
| 91. | unverified | not checked as true |
| 92. | vacillating | unable to choose firmly |
| 93. | vacillation | wavering between options |
| 94. | vague | not clearly expressed |
| 95. | warily | with caution and suspicion |
| 96. | wariness | cautious distrust |
| 97. | wary | cautious and suspicious |
| 98. | wavering | swaying between choices |
| 99. | who knows | nobody is certain |
| 100. | wondering | showing uncertainty |
